Surging/ poor idle


Information and questions on GL1500 Goldwings (1988-2000)
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sdadean
Posts: 12
Joined: Mon Aug 19, 2013 9:14 pm
Location: Rhinelander, WI
Motorcycle: 1992 1500 Aspencade

Surging/ poor idle

Postby sdadean » Sun Jul 06, 2014 10:04 am



1998 GL 1500, has been running great all season and just out of the blue. My first thoughts where a vacuum leak. I am not familiar with working on these bikes at all but was a auto mechanic 30 years ago. I sprayed a little carb cleaning in the carb areas and did find a very slight difference. Not sure where all the vac lines are or how to get to them.

Is there anything else that would cause these bikes to run like this that is common? something sticking? I don't think it would be a carb but could be wrong.

Need help to get my baby running correct.



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Dusty Boots
Posts: 573
Joined: Mon Oct 26, 2009 4:25 pm
Location: Alvinston, SW ON
Motorcycle: 1992 GL1500Aspencade

Re: Surging/ poor idle

Postby Dusty Boots » Sun Jul 06, 2014 4:01 pm

Depends on how much of a surge you have.

If it surges from 750 to 1100 RPM at idle only, try the easiest thing 1st by turning the idle adjustment knob (knurled knob ahead and to the right of gas cap) a few times up and down (it'll most likely be stiff/hard to turn so apply a spray lube) when the bike is running and then reset the idle speed. Give it a few small revs to see where the idle settles. Turn the bike off and then restart and you may have to readjust the idle again slightly.

If that doesn't cure it, then most likely vacuum lines

sdadean
Posts: 12
Joined: Mon Aug 19, 2013 9:14 pm
Location: Rhinelander, WI
Motorcycle: 1992 1500 Aspencade

Re: Surging/ poor idle

Postby sdadean » Sun Jul 06, 2014 7:32 pm

It surges from 750 to almost 2000 rpm's it's quite a bit. Ran just great one day and then blah! I ran sea foam in it before I stored it last winter. The worse part is when you try to ride and just as soon as you back of the throttle the rpms drop to the point it wants to die and then when you do give it more throttle its flat until about 2500 rpms. I am not sure if there are a few main vac lines that commonly good bad due to their location like close to the engine or a manifold where they get hot and dry out quickly? I am new to bikes. Have only ridden this one about 200 miles or 5-6 times. Learning a lot though.

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MikeB
Posts: 1223
Joined: Fri Dec 04, 2009 12:54 pm
Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Surging/ poor idle

Postby MikeB » Sun Jul 06, 2014 11:00 pm

Contaminated fuel would be a possibility too.
MikeB
Tacoma, WA, USA

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HawkeyeGL1200
Posts: 918
Joined: Sat Jul 05, 2014 11:53 am
Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Surging/ poor idle

Postby HawkeyeGL1200 » Mon Jul 07, 2014 8:42 am

There is a temperature sending unit on the engine that provides feedback to the ECU. If the terminals on the sending unit are corroded, or if the sending unit is bad, the engine will surge. I'll have to get a schematic for the GL1500, as I don't own one... but it can be the cause of engine surging in the 1500 series Goldwings.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

sdadean
Posts: 12
Joined: Mon Aug 19, 2013 9:14 pm
Location: Rhinelander, WI
Motorcycle: 1992 1500 Aspencade

Re: Surging/ poor idle

Postby sdadean » Mon Jul 07, 2014 12:51 pm

Thanks Mike I will check it. You mean the temp switch for the dash gauge? Or is there a separate one just for the computer? and the cooling fan switch? My dash temp gauge works good and my cooling fan switch is new. I will do a little looking around. I thought I would get some of the covers off the bike and try to spray the vac lines and connections a little more accurately.

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HawkeyeGL1200
Posts: 918
Joined: Sat Jul 05, 2014 11:53 am
Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Surging/ poor idle

Postby HawkeyeGL1200 » Mon Jul 07, 2014 3:38 pm

The sensor is located on the right intake manifold. It is item 22 in this drawing (going to try to upload the picture)
Attachments
generic parts drawing
generic parts drawing
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

eberlebike4
Posts: 55
Joined: Thu Feb 07, 2013 10:52 pm
Location: Mesa Verde,Co.
Motorcycle: 1988 GL1500 Goldwing
1976 Gl 1000 Black
1976 Gl1000 Yellow
1987 XL600R
2004 Fatboy HD

Re: Surging/ poor idle

Postby eberlebike4 » Mon Jul 07, 2014 6:51 pm

Had a similar prob.with my '88 and found that one of my lock ring's on the acc.cable where it mounts to the throttle on the handle bar vibrated loose:(...rebuild carbs last year and that was one **** to remove and install.They do not like water and/or any type of contaminant's.When i store the bike for winter i fill up the tank and add Lucas fuel treatment,in spring i drain tank and lines and fill with fresh fuel.Dont want to go thru that again:):)Oh yeah,new fuel filter is a must!!!:):)

wing in atlanta
Posts: 35
Joined: Fri Apr 12, 2013 9:55 pm
Location: fayetteville ga.
Motorcycle: 1996 gl1500a aspencade

Re: Surging/ poor idle

Postby wing in atlanta » Mon Jul 14, 2014 10:23 pm

There is a vacuum line under the rubber mat and forward of the carbs. The line has a 90 deg bend in it. You have to remove carbs to replace. Right at the bend it is commom for it to burn thru. Might want to do a search in the forum, it is a known issue.

sdadean
Posts: 12
Joined: Mon Aug 19, 2013 9:14 pm
Location: Rhinelander, WI
Motorcycle: 1992 1500 Aspencade

Re: Surging/ poor idle

Postby sdadean » Tue Jul 15, 2014 9:55 pm

Well great news, it's fixed! After learning how to basically take just about everything apart to get down to even see all the vacuum lines IF it was a vacuum line was quite special, But. that's exactly what it was, that little 90 line had burned through. Replaced it and its back to purring like a kitten. Thanks of all the input everyone and many of you had the problem pegged from the beginning. Nothing like experience.

wing in atlanta
Posts: 35
Joined: Fri Apr 12, 2013 9:55 pm
Location: fayetteville ga.
Motorcycle: 1996 gl1500a aspencade

Re: Surging/ poor idle

Postby wing in atlanta » Wed Jul 16, 2014 10:16 pm

Glad you got it fixed, and reporting back. Safe riding.




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